Benchmark: slice vs substr vs substring (only start index)

Script Preparation code:

var year = "2022";

Tests:

slice
year.slice(2);
substr
year.substr(2);
substring
year.substring(2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net, which compares the performance of three string slicing methods: `slice()`, `substr()`, and `substring()`.

**String Slicing Methods Compared**

The benchmark measures how quickly these three methods can extract a specific substring from a given string. Specifically, it extracts the second character (`'2'`) from the string `"2022"`.

Here are the methods being compared:

1.  **`slice()`**: The `slice()` method returns a new string created by extracting a section of an existing string. It takes two arguments: the start index and the end index (optional). If only one argument is provided, it extracts the slice from the start to that index.
2.  **`substr()`**: The `substr()` method also extracts a substring from a given string, but unlike `slice()`, it requires three arguments: the start index, the length of the substring, and an optional end index. If no end index is provided, it defaults to the end of the string.
3.  **`substring()`**: The `substring()` method returns a new string created by extracting a section of an existing string, similar to `slice()`. It takes two arguments: the start index and the length of the substring.

**Pros and Cons of Each Approach**

Here are some pros and cons for each approach:

1.  **`slice()`**: Pros:
    *   Faster execution due to its optimized implementation.
    *   More flexible, as it can be used with optional end indices.
2.  **`substr()`**: Pros:
    *   Easier to use when working with specific lengths and start indices.
3.  **`substring()`**: Pros:
    *   Similar performance to `slice()`, making it a suitable alternative.

Cons:

*   **`substr()`** is less flexible due to its three-argument requirement, which can make it harder to use for certain scenarios.
*   **`substring()`**, although similar in performance to `slice()`, might be slightly slower depending on the JavaScript engine and string length.

**Library Usage**

None of the benchmarked methods rely on any external libraries. They are all built-in JavaScript methods.

**Special JavaScript Features or Syntax**

There is no special JavaScript feature or syntax being used in this benchmark.

**Other Alternatives**

If you're looking for alternative approaches to measure the performance of string slicing, consider:

1.  **`charCodeAt()`**: This method can be used to extract individual characters from a string and then concatenated.
2.  **Regular Expressions (Regex)**: You can use regex to extract specific substrings or patterns from strings.
3.  **String manipulation functions in other languages**: Depending on the programming language you're using, there might be more efficient string slicing methods available.

Keep in mind that these alternatives might not provide the same level of performance as the built-in `slice()`, `substr()`, and `substring()` methods or might require additional setup.

Related benchmarks:

slice vs substr vs substring (only start index) (version: 0)

Comparing performance of: slice vs substr vs substring

Created: 3 years ago by: Guest

Jump to the latest result

slice

substr

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):